|Publication number||US4680528 A|
|Application number||US 06/835,935|
|Publication date||Jul 14, 1987|
|Filing date||Mar 4, 1986|
|Priority date||Mar 5, 1985|
|Publication number||06835935, 835935, US 4680528 A, US 4680528A, US-A-4680528, US4680528 A, US4680528A|
|Inventors||Toshio Mikami, Yasuo Nagasawa|
|Original Assignee||Toko, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (4), Referenced by (122), Classifications (7), Legal Events (4) |
|External Links: USPTO, USPTO Assignment, Espacenet|
Battery charging device
US 4680528 A
A battery charging device which is so designed that whether or not the battery is connected in position can be detected by utilizing a current detecting circuit instead of a mechanically-structured component, such as a switch.
1. A battery charging device, comprising:
a DC power source, output terminals for a battery, and a charging-starter switch connected between said DC power source and said output terminals so as to provide DC power at the output terminals by turning on the charging-starter switch;
a current detecting circuit connected to the output terminals for detecting whether or not a battery is connnected to the output terminals and for detecting a current flowing to the battery;
a voltage control circuit responsive to a signal derived from said current detecting circuit to provide a charging voltage or stand-by voltage of a predetermined magnitude at the output terminals; and
a current control circuit responsive to said signal to charge the battery with a current of a predetermined magnitude;
said current detecting circuit being OR-connected to said voltage control circuit and to said current control circuit.
2. A battery charging device according to claim 1, wherein a plurality of pairs of said output terminals are provided.
FIELD OF THE INVENTION
This invention relates to a device for charging a battery for use with portable electronic apparatus, and more particularly it pertains to such a device provided with improved means for detecting whether or not the battery is connected in position.
BACKGROUND OF THE INVENTION
In order to have a better understanding of the present invention, description will first be made of a conventional battery charging device, with reference to FIG. 1, which includes a DC power source 1, constant-current control circuit 2, constant-voltage control circuit 3, current detecting circuit 4, and switch 6 for detecting whether or not a battery 5 is connected in position. With this conventional device, by turning on a charging-starter switch 7, DC power is obtained at output terminals 8A and 8B so that the battery 5 connected therewith can be charged.
FIG. 3 illustrates the relationship between the output voltage V and output current I which occur at the output terminals 8A and 8B. As will be noted, the relationship represents a so-called drooping characteristic. Thus, if the battery is connected after the charging-starter switch 7 has been turned on, then a constant-voltage condition in which there prevails a charging voltage V1 which is higher than a voltage V3 prevailing at the end of the charging operation, will be changed to a constant-current condition where a charging current Il flows. In FIG. 3, V2 represents a stand-by voltage which prevails after the battery 5 has been charged up or when the battery 5 is not connected. The stand-by voltage V2, which is used primarily for preventing occurrence of an overcurrent, is selected to be lower than the voltage V3.
Whether or not the battery 5 is connected in position, is detected by means of the switch 6 which is provided in the neighborhood of the output terminals 8A and 8B and arranged to be pressed by the battery 5 when the latter is connected in position. Completion of the charging of the battery 5 can be detected by using a timer (not shown) and/or means for detecting the peak voltage of the battery.
However, the above-described conventional device is disadvantageous in that the position where the switch 6, which is a mechanically-structured component, can be provided is limited to a position where it can be disposed into contact with the battery 5, thus deteriorating the space efficiency in the arrangement of the entire components. Obviously, this is undesirable from the standpoint of miniaturization of the battery charging device.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a battery charging device which is so designed that whether or not the battery is connected in position, is detected by means of a current detecting circuit, thereby eliminating the necessity to provide a mechanically-structured component such as the aforementioned switch 6.
According to an aspect of the present invention, there is provided a battery charging device which comprises a DC power source which is adapted to provide DC power at the output terminals when a charging-starter switch is turned on; a current detecting circuit adapted for detecting whether or not the battery is connected to the output terminals and for detecting a current which flows through the battery when the latter is connected to the output terminals; a constant-voltage control circuit responsive to a signal derived from the current detecting circuit to provide a charging voltage or standby voltage across the output terminals; and a constant-current control circuit responsive to the signal derived from the current detecting circuit to charge the battery with a constant current.
Other objects, features and advantages of the present invention will become apparent from the ensuing description taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram showing a conventional battery charging device.
FIG. 2 is a block diagram showing the battery charging device according to an embodiment of the present invention.
FIG. 3 illustrates the characteristic of the battery charging device.
FIG. 4 is a fragmentary block diagram showing the battery charging device according to another embodiment of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIG. 2, there is shown the battery charging device according to an embodiment of the present invention, wherein parts corresponding to FIG. 1 are indicated by like reference numerals.
A DC power source 1 has its "hot" side connected to an output terminal 8A through a charging-starter switch 7 and a reverse current preventing diode 10, and it has its "cold" side connected to another output terminal 8B through a current detecting circuit 9.
The current detecting circuit 9 comprises a resistor 11 for detecting a current, and a transistor 12 whose collector current is caused to flow by a voltage which occurs across the resistor 11. The circuit 9 is OR-connected to both the constant-current control circuit 2 and the constant-voltage control circuit 3.
The constant-voltage control circuit 3 which is connected to one terminal of the diode 10, is adapted to detect a voltage corresponding to the voltage across the output terminals 8A and 8B and feed the thus detected voltage back to the DC power source 1 so that an output is provided under a constant-voltage condition at the output terminals 8A and 8B. The constant-current control circuit 2 is adapted to feed back to the DC power source 1 the signal derived from the current detecting circuit 9 which is arranged to detect the current flowing through the output terminals 8A and 8B so that an output is provided under a constant-current condition at the output terminals 8A and 8B.
The ranges for the constant-voltage and constant-current conditions are preset as illustrated in FIG. 3, from which it will be seen that the constant-voltage condition occurs for a low current while the constant-current condition occurs for a high current.
Furthermore, the current detecting circuit 9 is so designed as to detect both the condition where a current is flowing through the resistor 11 and the condition where no current is flowing therethrough. When no current is flowing through the resistor 11, the constant-current control circuit 3 provides a stand-by voltage V2 at the output terminals 8A and 8B, while when a current is flowing through the resistor 11, the constant-voltage condition where the charging voltage V1 prevails, is changed to the constant-current condition where the charging current I1 flows, primarily under the action of the constant-current control circuit 2.
With the above-described battery charger of the present invention, when no battery 5 is connected to the output terminals 8A and 8B, no current is caused to flow through the resistor 11 by turning on the charge-starter switch 7; thus, no collector current is caused to flow through the transistor 12. The resultant signal is provided to both of the constant-current control circuit 2 and constant-voltage control circuit 3, so that the stand-by voltage V2 is provided at the output terminals 8A and 8B under the action of the constant-voltage control circuit 3.
When the battery 5 is connected to the output terminals 8A and 8B and thus a current is caused to flow through the resistor 11, the transistor 12 is rendered conductive by a voltage across the resistor 11 so that a collector current is caused to flow therethrough. The resultant signal is provided to both of the constant-current control circuit 2 and constant-voltage control circuit 3, so that the charging voltage V1 is provided at the output terminals 8A and 8B; thereupon, a constant-current condition occurs, and rapid charging of the battery 5 is effected with the charging current I1 in the neighborhood of the charging voltage V1.
It is possible that the current detecting circuit 9 may be constituted by using a current transformer.
Referring to FIG. 4, there is shown, in a block diagram, the battery charging device according to another embodiment of the present invention, wherein only the output stage thereof is illustrated for the sake of simplicity. The battery charger of FIG. 4 includes three pairs of output terminals 21A and 21B; 22A and 22B; and 23A and 23B to which batteries 24, 25 and 26 are connected, respectively. The outut terminal pairs are switched by means of a switching circuit 20 so that the batteries 24, 25 and 26 can be successively charged. The switching circuit 20 comprises an electronic circuit including no mechanically-constructed components such as switches and which is so designed as to automatically change over the output terminals upon completion of charging of one battery.
It goes without saying that the the present charger may be so constructed that the three batteries can be charged at the same time by connecting the three pairs of output terminals in parallel to the "hot" and "cold" sides of the DC power source 1.
As will be appreciated from the above discussion, with the battery charging device of the present invention, detection as to whether or not a battery or batteries are connected in position, can be achieved with electronic circuits alone, instead of by using any mechanically-structured components such as switches, by virtue of the fact that a signal derived from the current detecting circuit is provided to both the constant-current control circuit and the constant-voltage control circuit.
Thus, according to the present invention, the necessity to provide a mechanically-structured part such as switch 6 which is limited in terms of mounting position as mentioned above, is eliminated so that miniaturization of the device can conveniently be achieved and the freedom of design thereof can also be enhanced. Needless to say, the manufacturing cost can be reduced correspondingly. Particularly, in the case where a plurality of pairs of output terminals are provided for charging a plurality of batteries either successively or concurrently, the manufacturing cost can greatly be reduced by virtue of the fact that there is no necessity to provide switches 6 to detect whether or not the respective batteries are connected in position. With the conventional construction mentioned hereinbefore, it has often happened that the charging voltage Vl is produced at the output terminals when the switch 6 is pressed by an object other than the battery; according to the present invention, such erroneous operation can be perfectly avoided. Obviously, this is also desirable from the standpoint of protecting the charger.
While the present invention has been illustrated and described with respect to specific embodiments thereof, it is to be understood that the invention is by no means limited thereto but encompasses all changes and modifications which will become possible within the scope of the appended claims.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US4198593 *||Aug 19, 1977||Apr 15, 1980||Ballman Gray C||Battery charger control device|
|US4233553 *||May 10, 1978||Nov 11, 1980||Ault, Inc.||Automatic dual mode battery charger|
|US4571533 *||Jan 21, 1983||Feb 18, 1986||Ranjit Dey||Storage battery charging and monitoring apparatus|
|US4577145 *||Oct 11, 1984||Mar 18, 1986||General Electric Company||Charging system having electromagnetic field means for distinguishing between primary and secondary batteries|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5172044 *||Feb 25, 1991||Dec 15, 1992||Sony Corporation||Multi-rate constant voltage battery charger with display|
|US5486749 *||Jun 21, 1993||Jan 23, 1996||Ast Research, Inc.||Multiple battery charger with a power source control|
|US5576608 *||May 3, 1994||Nov 19, 1996||Sony Corporation||Method for charging secondary battery and charger used therefor|
|US5606240 *||Sep 19, 1995||Feb 25, 1997||Sanyo Electric Co., Ltd.||Battery charger|
|US5729116 *||Dec 20, 1996||Mar 17, 1998||Total Battery Management, Inc.||Shunt recognition in lithium batteries|
|US5854551 *||Feb 26, 1997||Dec 29, 1998||Ericsson Inc.||Battery charger with low standby current|
|US5900718 *||Aug 16, 1996||May 4, 1999||Total Battery Management,||Battery charger and method of charging batteries|
|US5949220 *||Sep 24, 1997||Sep 7, 1999||Rohm Co., Ltd.||Battery charger|
|US6040685 *||Apr 10, 1997||Mar 21, 2000||Total Battery Management, Inc.||Energy transfer and equalization in rechargeable lithium batteries|
|US6043625 *||Jul 29, 1993||Mar 28, 2000||Eastman Kodak Company||Battery charging system with battery type and polarity discrimination|
|US6043631 *||Jan 2, 1998||Mar 28, 2000||Total Battery Management, Inc.||Battery charger and method of charging rechargeable batteries|
|US6259254||Jul 26, 1999||Jul 10, 2001||Midtronics, Inc.||Apparatus and method for carrying out diagnostic tests on batteries and for rapidly charging batteries|
|US6392414||Jun 7, 2001||May 21, 2002||Midtronics, Inc.||Electronic battery tester|
|US6417669||Jun 11, 2001||Jul 9, 2002||Keith S. Champlin||Suppressing interference in AC measurements of cells, batteries and other electrical elements|
|US6424158||Jul 10, 2001||Jul 23, 2002||Midtronics, Inc.||Apparatus and method for carrying out diagnostic tests on batteries and for rapidly charging batteries|
|US6441585||Jun 15, 2000||Aug 27, 2002||Midtronics, Inc.||Apparatus and method for testing rechargeable energy storage batteries|
|US6445158||May 22, 2000||Sep 3, 2002||Midtronics, Inc.||Vehicle electrical system tester with encoded output|
|US6456045||May 30, 2001||Sep 24, 2002||Midtronics, Inc.||Integrated conductance and load test based electronic battery tester|
|US6466025||Jan 13, 2000||Oct 15, 2002||Midtronics, Inc.||Alternator tester|
|US6466026||Oct 12, 2001||Oct 15, 2002||Keith S. Champlin||Programmable current exciter for measuring AC immittance of cells and batteries|
|US6469511||Jul 18, 2001||Oct 22, 2002||Midtronics, Inc.||Battery clamp with embedded environment sensor|
|US6495990||Aug 27, 2001||Dec 17, 2002||Keith S. Champlin||Method and apparatus for evaluating stored charge in an electrochemical cell or battery|
|US6544078||Jul 18, 2001||Apr 8, 2003||Midtronics, Inc.||Battery clamp with integrated current sensor|
|US6556019||Mar 19, 2002||Apr 29, 2003||Midtronics, Inc.||Electronic battery tester|
|US6566883||Oct 31, 2000||May 20, 2003||Midtronics, Inc.||Electronic battery tester|
|US6586941||Mar 23, 2001||Jul 1, 2003||Midtronics, Inc.||Battery tester with databus|
|US6621272||Oct 15, 2002||Sep 16, 2003||Keith S. Champlin||Programmable current exciter for measuring AC immittance of cells and batteries|
|US6633165||Sep 20, 2001||Oct 14, 2003||Midtronics, Inc.||In-vehicle battery monitor|
|US6696819||Jan 8, 2002||Feb 24, 2004||Midtronics, Inc.||Battery charge control device|
|US6707303||Nov 26, 2001||Mar 16, 2004||Midtronics, Inc.||Electronic battery tester|
|US6737831||Feb 8, 2002||May 18, 2004||Keith S. Champlin||Method and apparatus using a circuit model to evaluate cell/battery parameters|
|US6759849||Oct 25, 2002||Jul 6, 2004||Kevin I. Bertness||Battery tester configured to receive a removable digital module|
|US6781382||Dec 5, 2002||Aug 24, 2004||Midtronics, Inc.||Electronic battery tester|
|US6788025||Jun 21, 2002||Sep 7, 2004||Midtronics, Inc.||Battery charger with booster pack|
|US6795782||Dec 5, 2002||Sep 21, 2004||Midtronics, Inc.||Battery test module|
|US6806716||Jan 29, 2004||Oct 19, 2004||Kevin I. Bertness||Electronic battery tester|
|US6850037||Oct 15, 2002||Feb 1, 2005||Midtronics, Inc.||In-vehicle battery monitor|
|US6871151||Mar 7, 2002||Mar 22, 2005||Midtronics, Inc.||Electronic battery tester with network communication|
|US6885195||Mar 14, 2002||Apr 26, 2005||Midtronics, Inc.||Method and apparatus for auditing a battery test|
|US6888468||Jan 22, 2003||May 3, 2005||Midtronics, Inc.||Apparatus and method for protecting a battery from overdischarge|
|US6891378||Mar 25, 2003||May 10, 2005||Midtronics, Inc.||Electronic battery tester|
|US6906522||Mar 29, 2002||Jun 14, 2005||Midtronics, Inc.||Battery tester with battery replacement output|
|US6906523||Apr 9, 2002||Jun 14, 2005||Midtronics, Inc.||Method and apparatus for testing cells and batteries embedded in series/parallel systems|
|US6909287||Oct 29, 2001||Jun 21, 2005||Midtronics, Inc.||Energy management system for automotive vehicle|
|US6913483||Jun 23, 2003||Jul 5, 2005||Midtronics, Inc.||Cable for electronic battery tester|
|US6914413||Sep 5, 2003||Jul 5, 2005||Midtronics, Inc.||Alternator tester with encoded output|
|US6919725||Oct 3, 2003||Jul 19, 2005||Midtronics, Inc.||Electronic battery tester/charger with integrated battery cell temperature measurement device|
|US6930485||Mar 14, 2003||Aug 16, 2005||Midtronics, Inc.||Electronic battery tester with battery failure temperature determination|
|US6933727||Jun 23, 2003||Aug 23, 2005||Midtronics, Inc.||Electronic battery tester cable|
|US6941234||Sep 30, 2003||Sep 6, 2005||Midtronics, Inc.||Query based electronic battery tester|
|US6967484||Jun 12, 2003||Nov 22, 2005||Midtronics, Inc.||Electronic battery tester with automotive scan tool communication|
|US6998847||Jul 1, 2004||Feb 14, 2006||Midtronics, Inc.||Electronic battery tester with data bus for removable module|
|US7003410||Jun 17, 2004||Feb 21, 2006||Midtronics, Inc.||Electronic battery tester with relative test output|
|US7003411||Aug 9, 2004||Feb 21, 2006||Midtronics, Inc.||Electronic battery tester with network communication|
|US7012433||Sep 18, 2002||Mar 14, 2006||Midtronics, Inc.||Battery tester upgrade using software key|
|US7015674||Mar 28, 2002||Mar 21, 2006||Midtronics, Inc.||Booster pack with storage capacitor|
|US7034541||May 17, 2005||Apr 25, 2006||Midtronics, Inc.||Query based electronic battery tester|
|US7039533||Dec 5, 2002||May 2, 2006||Midtronics, Inc.||Battery test module|
|US7058525||Aug 13, 2002||Jun 6, 2006||Midtronics, Inc.||Battery test module|
|US7081755||Sep 3, 2003||Jul 25, 2006||Midtronics, Inc.||Battery tester capable of predicting a discharge voltage/discharge current of a battery|
|US7106070||Jul 22, 2004||Sep 12, 2006||Midtronics, Inc.||Broad-band low-inductance cables for making Kelvin connections to electrochemical cells and batteries|
|US7116109||Nov 11, 2003||Oct 3, 2006||Midtronics, Inc.||Apparatus and method for simulating a battery tester with a fixed resistance load|
|US7119686||Apr 13, 2004||Oct 10, 2006||Midtronics, Inc.||Theft prevention device for automotive vehicle service centers|
|US7126341||Jul 19, 2002||Oct 24, 2006||Midtronics, Inc.||Automotive vehicle electrical system diagnostic device|
|US7154276||Sep 5, 2003||Dec 26, 2006||Midtronics, Inc.||Method and apparatus for measuring a parameter of a vehicle electrical system|
|US7198510||Nov 14, 2001||Apr 3, 2007||Midtronics, Inc.||Kelvin connector for a battery post|
|US7208914||Dec 30, 2003||Apr 24, 2007||Midtronics, Inc.||Apparatus and method for predicting the remaining discharge time of a battery|
|US7246015||Jun 9, 2004||Jul 17, 2007||Midtronics, Inc.||Alternator tester|
|US7295936||Feb 16, 2006||Nov 13, 2007||Midtronics, Inc.||Electronic battery tester with relative test output|
|US7319304||Jul 23, 2004||Jan 15, 2008||Midtronics, Inc.||Shunt connection to a PCB of an energy management system employed in an automotive vehicle|
|US7363175||Apr 24, 2006||Apr 22, 2008||Midtronics, Inc.||Query based electronic battery tester|
|US7398176||Feb 13, 2006||Jul 8, 2008||Midtronics, Inc.||Battery testers with secondary functionality|
|US7408358||Jun 16, 2003||Aug 5, 2008||Midtronics, Inc.||Electronic battery tester having a user interface to configure a printer|
|US7425833||Sep 12, 2006||Sep 16, 2008||Midtronics, Inc.||Broad-band low-inductance cables for making Kelvin connections to electrochemical cells and batteries|
|US7446536||Oct 5, 2004||Nov 4, 2008||Midtronics, Inc.||Scan tool for electronic battery tester|
|US7479763||Mar 18, 2004||Jan 20, 2009||Midtronics, Inc.||Apparatus and method for counteracting self discharge in a storage battery|
|US7498767||Feb 16, 2006||Mar 3, 2009||Midtronics, Inc.||Centralized data storage of condition of a storage battery at its point of sale|
|US7501795||Jun 3, 2004||Mar 10, 2009||Midtronics Inc.||Battery charger with booster pack|
|US7505856||Jun 2, 2005||Mar 17, 2009||Midtronics, Inc.||Battery test module|
|US7545146||Dec 9, 2004||Jun 9, 2009||Midtronics, Inc.||Apparatus and method for predicting battery capacity and fitness for service from a battery dynamic parameter and a recovery voltage differential|
|US7557586||May 19, 2003||Jul 7, 2009||Midtronics, Inc.||Electronic battery tester|
|US7595643||Aug 21, 2006||Sep 29, 2009||Midtronics, Inc.||Apparatus and method for simulating a battery tester with a fixed resistance load|
|US7598699||Feb 20, 2004||Oct 6, 2009||Midtronics, Inc.||Replaceable clamp for electronic battery tester|
|US7598743||Feb 22, 2005||Oct 6, 2009||Midtronics, Inc.||Battery maintenance device having databus connection|
|US7598744||Jun 7, 2005||Oct 6, 2009||Midtronics, Inc.||Scan tool for electronic battery tester|
|US7619417||Dec 14, 2006||Nov 17, 2009||Midtronics, Inc.||Battery monitoring system|
|US7642786||May 31, 2005||Jan 5, 2010||Midtronics, Inc.||Battery tester capable of identifying faulty battery post adapters|
|US7642787||Oct 24, 2006||Jan 5, 2010||Midtronics Inc.||Automotive vehicle electrical system diagnostic device|
|US7656162||Jul 22, 2004||Feb 2, 2010||Midtronics Inc.||Electronic battery tester with vehicle type input|
|US7688074||Jun 14, 2004||Mar 30, 2010||Midtronics, Inc.||Energy management system for automotive vehicle|
|US7705602||Aug 29, 2006||Apr 27, 2010||Midtronics, Inc.||Automotive vehicle electrical system diagnostic device|
|US7706991||Jun 11, 2007||Apr 27, 2010||Midtronics, Inc.||Alternator tester|
|US7710119||Dec 14, 2005||May 4, 2010||Midtronics, Inc.||Battery tester that calculates its own reference values|
|US7723993||Sep 2, 2003||May 25, 2010||Midtronics, Inc.||Electronic battery tester configured to predict a load test result based on open circuit voltage, temperature, cranking size rating, and a dynamic parameter|
|US7728597||Nov 3, 2008||Jun 1, 2010||Midtronics, Inc.||Electronic battery tester with databus|
|US7772850||Jul 11, 2005||Aug 10, 2010||Midtronics, Inc.||Wireless battery tester with information encryption means|
|US7774151||Dec 21, 2004||Aug 10, 2010||Midtronics, Inc.||Wireless battery monitor|
|US7777612||Aug 3, 2006||Aug 17, 2010||Midtronics, Inc.||Theft prevention device for automotive vehicle service centers|
|US7791348||Feb 27, 2007||Sep 7, 2010||Midtronics, Inc.||Battery tester with promotion feature to promote use of the battery tester by providing the user with codes having redeemable value|
|US7808375||Apr 9, 2008||Oct 5, 2010||Midtronics, Inc.||Battery run down indicator|
|US7924015||May 6, 2010||Apr 12, 2011||Midtronics, Inc.||Automotive vehicle battery test system|
|US7940052||Feb 2, 2010||May 10, 2011||Midtronics, Inc.||Electronic battery test based upon battery requirements|
|US7940053||May 25, 2010||May 10, 2011||Midtronics, Inc.||Battery tester with promotion feature|
|US7977914||Oct 31, 2007||Jul 12, 2011||Midtronics, Inc.||Battery maintenance tool with probe light|
|US7999505||Oct 5, 2004||Aug 16, 2011||Midtronics, Inc.||In-vehicle battery monitor|
|US8164343||Oct 30, 2008||Apr 24, 2012||Midtronics, Inc.||Method and apparatus for measuring a parameter of a vehicle electrical system|
|US8198900||Mar 2, 2004||Jun 12, 2012||Midtronics, Inc.||Automotive battery charging system tester|
|US8203345||Dec 4, 2008||Jun 19, 2012||Midtronics, Inc.||Storage battery and battery tester|
|US8237448||Jul 7, 2008||Aug 7, 2012||Midtronics, Inc.||Battery testers with secondary functionality|
|US8306690||Jul 17, 2008||Nov 6, 2012||Midtronics, Inc.||Battery tester for electric vehicle|
|US8344685||Apr 1, 2009||Jan 1, 2013||Midtronics, Inc.||System for automatically gathering battery information|
|US8436619||Apr 1, 2009||May 7, 2013||Midtronics, Inc.||Integrated tag reader and environment sensor|
|US8442877||Apr 1, 2009||May 14, 2013||Midtronics, Inc.||Simplification of inventory management|
|US8493022||Apr 22, 2010||Jul 23, 2013||Midtronics, Inc.||Automotive vehicle electrical system diagnostic device|
|US8513949||Sep 4, 2008||Aug 20, 2013||Midtronics, Inc.||Electronic battery tester or charger with databus connection|
|US8674654||Aug 9, 2011||Mar 18, 2014||Midtronics, Inc.||In-vehicle battery monitor|
|US8674711||Dec 19, 2006||Mar 18, 2014||Midtronics, Inc.||Method and apparatus for measuring a parameter of a vehicle electrical system|
|US8738309||Sep 30, 2010||May 27, 2014||Midtronics, Inc.||Battery pack maintenance for electric vehicles|
|US9052366||Aug 6, 2012||Jun 9, 2015||Midtronics, Inc.||Battery testers with secondary functionality|
|EP0731545A2 *||Feb 29, 1996||Sep 11, 1996||Motorola, Inc.||Circuit and method for battery charge control|
|EP2787620A3 *||Apr 2, 2014||May 6, 2015||Bel Fuse (Macao Commercial Offshore) Ltd. (MCO)||Power supply having selectable operation based on communications with load|
|WO2000007256A1 *||Jul 26, 1999||Feb 10, 2000||Gnb Technologies||Apparatus and method for carrying out diagnostic tests on batteries and for rapidly charging batteries|
|Mar 4, 1986||AS||Assignment|
Owner name: TOKO, INC., 1-17, 2-CHOME, HIGASHI, YUKIGAYA, OHTA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:MIKAMI, TOSIO;NAGASAWA, YASUO;REEL/FRAME:004524/0888
Effective date: 19860215
|Nov 2, 1990||FPAY||Fee payment|
Year of fee payment: 4
|Sep 30, 1994||FPAY||Fee payment|
Year of fee payment: 8
|Jan 11, 1999||FPAY||Fee payment|
Year of fee payment: 12